Chapter 1: Programming Exercises From The Book

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Programming Exercises

The exercises in this section are optional and do not report to the performance dashboard. Instructors can decide whether to assign these exercises and students can check the correctness of their programs using the Check Exercise tool.

Pedagogical Note

We cannot stress enough the importance of learning programming through exercises. For this reason, the book provides a large number of programming exercises at various levels of difficulty. The problems cover many application areas, including math, science, business, financial, gaming, animation, and multimedia. Solutions to most even-numbered programming exercises are available from Solution under Supplement in the Table of Contents. Solutions to most odd-numbered programming exercises are in the Instructor Resources section under the Resources tab in the Instructor Revel Account. The level of difficulty is rated easy (no star), moderate $(*)$ $(*)$ , hard $(* *)$ $(* *)$ , or challenging $(* * *)$ $(* * *)$ .

Solution For Even Numbered Programming Exercises

1.1 (Display three messages) Write a program that displays Welcome to Java, Welcome to Computer Science, and Programming is fun.

1.2 (Display five messages) Write a program that displays Welcome to Java five times.

*1.3 (Display a pattern) Write a program that displays the following pattern:

1.4 (Print a table) Write a program that displays the following table:

1.5 (Compute expressions) Write a program that displays the result of

\frac{9.5 \times 4.5 - 2.5 \times 3}{45.5 - 3.5} .

$\frac{9.5 \times 4.5 - 2.5 \times 3}{45.5 - 3.5} .$

1.6 (Summation of a series) Write a program that displays the result of

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9.

$1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9.$

1.7 (Approximate $π$ $π$ ) $π$ $π$ can be computed using the following formula:

π = 4 \times (1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11} + \dots)

$π = 4 \times (1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11} + \dots)$

Write a program that displays the result of $4 \times (1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11})$ $4 \times (1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11})$ and $4 \times (1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11} + \frac{1}{13} - \frac{1}{15})$ $4 \times (1 - \frac{1}{3} + \frac{1}{5} - \frac{1}{7} + \frac{1}{9} - \frac{1}{11} + \frac{1}{13} - \frac{1}{15})$ . Use 1.0 instead of 1 in your program.

1.8 (Area and perimeter of a circle) Write a program that displays the area and perimeter of a circle that has a radius of 5.5 using the following formulas:

\begin{matrix} p e r i m e t e r = 2 \times r a d i u s \times π \\ a r e a = r a d i u s \times r a d i u s \times π \end{matrix}

$\begin{matrix} p e r i m e t e r = 2 \times r a d i u s \times π \\ a r e a = r a d i u s \times r a d i u s \times π \end{matrix}$

1.9 (Area and perimeter of a rectangle) Write a program that displays the area and perimeter of a rectangle with a width of 4.5 and a height of 7.9 using the following formula:

a r e a = w i d t h \times h e i g h t

$a r e a = w i d t h \times h e i g h t$

1.10 (Average speed in miles) Assume that a runner runs 14 kilometers in 45 minutes and 30 seconds. Write a program that displays the average speed in miles per hour. (Note 1 mile is equal to 1.6 kilometers.)

1.11 (Population projection) The U.S. Census Bureau projects population based on the following assumptions

One birth every 7 seconds
One death every 13 seconds
One new international migration every 45 seconds

Write a program to display the population for each of the next five years. Assume that the current population is 312,032,486, and one year has 365 days. Hint: In Java, if two integers perform division, the result is an integer. The fractional part is truncated. For example, 5 / 4 is 1 (not 1.25) and 10 / 4 is 2 (not 2.5). To get an accurate result with the fractional part, one of the values involved in the division must be a number with a decimal point. For example, 5.0 / 4 is 1.25 and 10 / 4.0 is 2.5.

1.12 (Average speed in kilometers) Assume that a runner runs 24 miles in 1 hour, 40 minutes, and 35seconds. Write a program that displays the average speed in kilometers per hour. (Note 1 mile is equal to 1.6 kilometers.)

*1.13 (Algebra: solve $2 cross times 2$ $2 cross times 2$ linear equations) You can use Cramer’s rule to solve the following $2 cross times 2$ $2 cross times 2$ system of linear equation provided that $a d - b c$ $a d - b c$ is not 0:

\begin{array}{l} a x + b y = e \\ c x + d y = f \end{array} x = \frac{e d - b f}{a d - b c} y = \frac{a f - e c}{a d - b c}

$\begin{array}{l} a x + b y = e \\ c x + d y = f \end{array} x = \frac{e d - b f}{a d - b c} y = \frac{a f - e c}{a d - b c}$

Write a program that solves the following equation and displays the value for $x$ $x$ and $y :$ $y :$ (Hint: replace the symbols in the formula with numbers to compute $x$ $x$ and $y .$ $y .$ This exercise can be done in Chapter 1 without using materials in later chapters.)

\begin{array}{l} 3.4 x + 50.2 y = 44.5 \\ 2.1 x + .55 y = 5.9 \end{array}

$\begin{array}{l} 3.4 x + 50.2 y = 44.5 \\ 2.1 x + .55 y = 5.9 \end{array}$

Note

More than 200 additional programming exercises with solutions are provided to the instructors in the Instructor Resources section under the Resources tab in the Instructor Revel Account.